Based on the siddur of Saadia Gaon, Persian liturgy developed over hundreds of years into a distinct rite entirely separate from those of Ashkenazi, Sephardic, and Yemenite Jews. Persian Jews generally sat on the floor, removed their shoes in synagogues, and likely regularly engaged in full prostration. But genizah manuscripts reveal fascinating variations in language and Persian Jewish tradition that suggest our forgotten heritage is a unique one among modern Jewish communities.